Hey guys should I be worry when my temp gauges raises when driving on a mountain with a 9% up hill? On my PFC Commander it will hot 100 c on my auto gauge it would read 200+For at least 3-4 miles. Once I reach to the top of the mountain the temp will drop to normal in a heart beat and then I have no issue. Only on that hill will my temp raisers. I have a 1993 Rx-7 with mods, GT35r 3inch exhaust PFC up grade radiator

 

the car does have to work harder going up a hill, i notice my my temp rises to a near 180-190 F , going up hill and then drops down after, simply turn your fans on if your worried .

do you have a v-mount of fmic?

 

200+ is kinda high for just climbing hill, still running the stock fan switch?

 

200 is not too hot for climbing a long hill. Dont worry about it. If it gets over 220, then it may be time to take it easy.

 

Stock fan, turns on when it hits 85C on the Power FC. I have a front mount setup. Like i said once I get to the top of the mountain and it flatten out, the temp would drop so quickly.

 

from my limited mountain driving experience . Same thing happened to me I saw temps of even 106 but asoon as it flattened out or went downhill temps instantly dropped. there are little tricks to retain your temps somewhat . like vented hood , and cheaper is adding more water / then antifreeze with some water wetter if you haven't yet. also if you dont have a second oilcooler adding one will help a bit.

but I dont think 100C is much to worry about the PFC started the fans up at 99C with the stock map .

 

Do you slow down going up hill? And do you have ducting? If not the extra strain with no ducting will make the car go hotter.

JT

 

I had this issue forever. Even on an all aluminum koyo radiator with fans and undertray.

Dropped in a new motor, single turbo etc....SAME ISSUE.

Replaced the Koyo with a Koyo N-Flo Dual Pass, PROBLEM SOLVED. I might get a slight fluctuation up hills, but never does the temp climb above 200F, even in traffic.


My belief is that the stock water pump does not flow very well for this car, and cannot move the the water through rapidly enough. Adding the dual pass allows the water to pass through the radiator twice helping the cooling capacity tremendously.


I have a hard time believing that a slight load is increase is causing temps to rise when cruising up a slight incline....why? Because temps do not increase under 19+ psi of boost on a dyno lol. Thats certainly more load then 2nd gear with barely anything throttle on a 9% grade. I believe its the gravity of the hill adding resistance to the water pump which is why the temps fall like a rock instantly as you cross the top.

Whatever the reason, EVERY FD NEEDS AN N-FLO!

 

Sustained hill climbing is typically considered a more severe condition than WOT pulls with cool down in between.

 

If you are running the aircon delete, just turn the interior fan to a setting (1-4) and then push the air con button.
This turns the engine fans on to 100% full force.

Do this at will, or slightly before going up a long hill. Temps should stay reasonable then.

I turn my fans on in this way at 80C while cruising towards a big hill at 50mph, and keep them running full speed while climbing the hill. Going down the other side I turn them off, and the temp is 85C-barely 90C.

I only learned of this trick the other day though.

 

Mmmmmm ^It may not be anymore complicated than this.

 

The A/C button does not always cause the fans to run on HIGH speed.

Under most conditions, it will get you LOW speed fans.

If the ECU is calling for radiator fans then adding the A/C request will get you MED.

If the ECU and the water temperature switch are calling for fans then it will get you HIGH.

Basically it +1's the current fan speed up to a maximum of HIGH, where all possible fan speeds are 0 (off),1,2,3

 

I disagree with pretty much all of this.

 

Everything about this thread is just WRONG!!!! LOL

Imagine a car that goes up a mountain/hill and runs hotter than normal it just makes no since at all

PS 100c isn't even hot it's 212f which is normal operating temp on a summer day cruising around with your AC on

 

Hahaha, I'm telling you guys I was plagued with this issue for the past 5 years. (Not really a problem as I never went over 210F)

I even went so far to park my car on an incline and noticed the temps rise! NOT MOVING, NO LOAD.

It was as if the steep inclined angle caused the temps to rise. Once I switched to the N-Flo, no issues.

You can disagree with the cause, but all I know is my problem is solved at this point from upgrading the radiator.

 

If you think you have it tough.

I couldn't make it over a mountain pass without stopping 4 times on the way up when driving my newly purchased car from CA to CO. The car definitely needed some maintenance and I fixed the majority of the issues. But I still doubt I could climb the mountain pass with everything I have done.


The problem is most people go up the mountain at about 30-60MPH which would be around a 3rd gear pull. The mountain has a steep grade of probably 5-7% and they last for many miles. We go from 5,000FT to the pass of 12,000FT. Big semi trucks probably go 20-30MPH and sometimes slow traffic down depending on if one truck is passing another.

Keep in mind that the air content is 30-40% less at that altitude. so you have 30-40% less cooling capacity and climbing a HUGE mountain. Hell, you have 20-25% less cooling capacity than sea level right when you start climbing the mountain.

so I laugh when flat landers say "something is definitely wrong", or The car should never get to 100C+, etc.

so I will ask, Has anyone climbed the mountain pass in CO on I-70? What temps did you get when climing?

 

If I understand this correctly, you just stated that you were plagued by an issue that wasnt really a problem. Please don't try to explain that. My head wont be able to handle the explanation without exploding.

So you parked your car, thus no air going thru the radiator, and you were surprised that the temps went up. Please dont try to explain that either.

Here's are some facts:

Driving up a hill increases load on an engine.

Increased load causes temperatures to rise.

This is normal. Its physics. It's the way things are.

It might be better if you didnt post again on this thread. You have already lost a lot of credibility.

 

Remember these things ran 105C from the factory... I'm not saying you shouldn't want to run it cooler than that, but I wouldn't be alarmed if it's running warm when climbing a hill. It's like towing in the way it loads the engine down.

 

If you wanna fix it the only thing you can really do is get better ducting work assuming yours isnt sufficient. I daily drove my fd with a front mount and no ducting with an undertray and temps that high were common going up steep hills. But front mounts are just a bad idea in a street fd unless you have a crazy rad set up.

 

Chill out.

Simple point, temps always climbed going up hill or sitting at an incline. Swapping in an n-flo kept temps rock solid at 185-190F no matter what the circumstance.